GROUP CONTENTS GENERAL DESCRIPTION RADIATOR SPECIAL TOOL THERMOSTAT ENGINE COOLING DIAGNOSIS...

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1 14-1 GROUP 14 CONTENTS GENERAL DESCRIPTION 14-2 SPECIAL TOOL 14-2 ENGINE COOLING DIAGNOSIS 14-3 INTRODUCTION 14-3 TROUBLESHOOTING STRATEGY 14-3 SYMPTOM CHART 14-3 SYMPTOM PROCEDURES 14-4 ON-VEHICLE SERVICE ENGINE COOLANT LEAK CHECK RADIATOR CAP PRESSURE CHECK ENGINE COOLANT REPLACEMENT ENGINE COOLANT CONCENTRATION TEST FAN CONTROLLER CHECK FAN CONTROL RELAY CONTINUITY CHECK RADIATOR REMOVAL AND INSTALLATION THERMOSTAT REMOVAL AND INSTALLATION INSPECTION WATER PUMP REMOVAL AND INSTALLATION WATER HOSE AND WATER PIPE REMOVAL AND INSTALLATION INSPECTION SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS SERVICE SPECIFICATIONS COOLANT SEALANT 14-32

2 GENERAL 14-2 The cooling system is designed to keep every part of the engine at appropriate temperature in whatever condition the engine may be operated The cooling method is of the water-cooled, pressure forced circulation type in which the water pump pressurizes coolant and circulates it throughout the engine If the coolant temperature exceeds the prescribed temperature, the thermostat opens to circulate the coolant through the radiator as well so that the heat absorbed by the coolant may be radiated into the air CONSTRUCTION DIAGRAM GENERAL DESCRIPTION DESCRIPTION M The water pump is of the centrifugal type and is driven by the drive belt from the crankshaft The radiator is the corrugated fin, down flow type and is cooled by an electrical radiator fan And if the engine coolant temperature reaches 110 C (230 F) or higher, the radiator fan control rotates the radiator fan for up to 5 minutes even after the ignition switch is turned to the "LOCK" (OFF) position [the fan stops its rotation when the engine coolant temperature decreases to 110 C (230 F) or lower] RADIATOR SUPPORT RADIATOR RESERVE TANK LOWER INSULATOR A/T OIL COOLER HOSE AC AB SPECIAL TOOL M TOOL TOOL NUMBER AND NAME MB LLC changer SUPERSSION APPLICATION Coolant refilling MB991871

3 INTRODUCTION 14-3 ENGINE COOLING DIAGNOSIS ENGINE COOLING DIAGNOSIS The system cools the engine so that it does not overheat and maintains the engine at an optimum temperature The system components are the radiator, water pump, thermostat, condenser fan assembly Possible faults include low coolant, contamination, belt loosening and component damage TROUBLESHOOTING STRATEGY Use these steps to plan your diagnostic strategy If you follow them carefully, you will be sure to find most of the engine cooling faults 1 Gather information from the customer SYMPTOM CHART SYMPTOMS M M Verify that the condition described by the customer exists 3 Find and repair the malfunction by following the SYMPTOM CHART 4 Verify that the malfunction is eliminated INSPECTION PROCEDURE REFERENCE PAGE Coolant Leak 1 P14-4 Engine Overheating 2 P14-4 Radiator Fan and Condenser Fan do not Operate 3 P14-6 Radiator Fan and Condenser Fan do not Change Speed or Stop 4 P14-13 Radiator Fan does not Operate 5 P14-16 Condenser Fan does not Operate 6 P14-16 M

4 14-4 SYMPTOM PROCEDURES ENGINE COOLING DIAGNOSIS INSPECTION PROCEDURE 1: Coolant Leak DIAGNOSIS CAP ADAPTER ADAPTER STEP 1 Check for coolant leaks WARNING When pressure testing the cooling system, slowly release cooling system pressure to avoid getting burned by hot coolant CAUTION Be sure to completely clean away any moisture from the places checked When the tester is removed, be careful not to spill any coolant from it When installing and removing the tester and when testing, be careful not to deform the filler neck of the radiator Check that the coolant level is up to the filler neck Install a radiator tester and apply 160 kpa (23 psi) pressure, and then check for leakage from the radiator hose or connections Q: Is leakage present from the radiator hose or connections? YES : Repair or replace the appropriate part, then go to Step 2 NO : There is no action to be taken ACX01844 AB STEP 2 Check symptoms Q: Can the symptom be reproduced? YES : Return to Step 1 NO : This diagnosis is complete INSPECTION PROCEDURE 2: Engine Overheating DIAGNOSIS STEP 1 Remove the radiator cap and check for coolant contamination Q: Is the coolant contaminated with rust and oil? YES : Replace it Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56 NO : There is no action to be taken, go to Step 2

5 14-5 ENGINE COOLING DIAGNOSIS CAP ADAPTER STEP 2 Check the radiator cap valve opening pressure NOTE: Be sure that the cap is clean before testing Rust or other foreign material on the cap seal will cause an improper reading (1) Use a cap adapter to attach the cap to the tester (2) Increase the pressure until the gauge indicator stops moving Minimum limit: 64 kpa (92 psi) Standard value: kpa (11 15 psi) Q: Does the reading remain at or above the minimum limit? YES : Go to Step 3 NO : Replace the radiator cap Then go to Step 5 ACX01845 AB STEP 3 Check thermostat operation Refer to P14-24 Q: Is the thermostat operate correctly? YES : Go to Step 4 NO : Replace the thermostat, then go to Step 5 STEP 4 Check the drive belt for slippage or damage Refer to GROUP 00, Maintenance Service Drive Belts (Check Condition) P00-44 Q: Is the drive belt loose or damaged? YES : Adjust or replace the drive belt, then go to Step 5 NO : There is no action to be taken STEP 5 Check symptoms Check the coolant temperature gauge Q: Is the coolant temperature abnormally high? YES : Return to Step 2 NO : This diagnosis is complete

6 14-6 ENGINE COOLING DIAGNOSIS INSPECTION PROCEDURE 3: Radiator Fan and Condenser Fan do not Operate <24L ENGINE> Radiator Fan and Condenser Driver Circut AC AB

7 14-7 ENGINE COOLING DIAGNOSIS <30L ENGINE> AC AB CONNECTORS: A-09X, A-18X A-18X A-09X BATTERY FUSIBLE LINK (2) AC102598AB AC AG

8 14-8 CONNECTOR: C-07 ENGINE COOLING DIAGNOSIS CONNECTORS: A-30, A-30-1 A-30 RADIATOR FAN AC AC A-30-1 AC000260AD CONNECTOR: C-49 <24L-M/T>, C-50 <24L-A/T> C-51 <30L-M/T>, C-52 <30L-A/T> ECM <M/T> OR PCM <A/T> AC AE CIRCUIT OPERATION The fan controller is powered from fusible link number 2 The ECM <M/T> or PCM <A/T> judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor The ECM <M/T> or PCM <A/T> activates the fan controller to drive the radiator fan motor and condenser fan motor TECHNICAL DESCRIPTION The cause could be a malfunction of the fan controller power supply or ground circuit The cause could also be a malfunction of the fan controller or the ECM <M/T> or PCM <A/T> TROUBLESHOOTING HINTS Malfunction of fusible link Malfunction of fan control relay Malfunction of fan controller Malfunction of ECM <M/T> or PCM <A/T> Damaged wiring harness or connector CONNECTOR A-30 AC AB DIAGNOSIS Required Special Tool: MB991223: Harness Set STEP 1 Check the circuit at fan controller connector A-30 (terminal number 3) (1) Disconnect fan controller connector A-30 (terminal number 3), and measure at the harness side connector (2) Measure the voltage between terminal number 3 and ground When the ignition switch is turned to "ON" position, voltage should be battery positive voltage Q: Is the voltage battery positive voltage when the ignition switch is turned to "ON" position? YES : Go to Step 7 NO : Go to Step 2

9 14-9 ENGINE COOLING DIAGNOSIS STEP 2 Check the fan control relay Refer to P14-20 Q: Is the fan control relay in good condition? YES : Go to Step 3 NO : Replace it, then go to Step 10 CONNECTOR: A-09X STEP 3 Check for continuity between fusible link number 2 and fan control relay connector A-09X (terminal number 4) Q: Are the harness wires between fusible link number 2 and fan control relay connector A-09X (terminal number 4) damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 4 A-09X AC AC BATTERY FUSIBLE LINK (2) AC AG

10 14-10 ENGINE COOLING DIAGNOSIS CONNECTOR: A-09X STEP 4 Check for continuity between fan control relay connector A-09X (terminal number 2) and fan controller connector A-30 (terminal number 3) Q: Are the harness wires between fan control relay connector A-09X (terminal number 2) and fan controller connector A-30 (terminal number 3) damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 5 A-09X AC AC CONNECTOR: A-30 RADIATOR FAN AC AB CONNECTORS: A-09X, A-18X A-18X STEP 5 Check for continuity between MFI relay connector A-18X (terminal number 4) and fan control relay connector A-09X (terminal number 1) Q: Are the harness wires between MFI relay connector A- 18X (terminal number 4) and fan control relay connector A-09X (terminal number 1) damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 6 A-09X AC102598AB CONNECTOR: A-09X STEP 6 Check for continuity between fan control relay connector A-09X (terminal number 3) and ground Q: Are the harness wires between fan control relay connector A-09X (terminal number 3) and ground damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 7 A-09X AC AC

11 14-11 ENGINE COOLING DIAGNOSIS CONNECTOR: A-30 STEP 7 Check the circuit at fan controller connector A-30 (terminal number 1) (1) Disconnect fan controller connector A-30 (terminal number 1), and measure at the harness side connector (2) Measure the resistance between terminal number 1 and ground Q: Is the resistance less than 2 ohm? YES : Go to Step 9 NO : Go to Step 8 AC AB CONNECTOR: A-30 STEP 8 Check the harness wire between fan controller connector A-30 (terminal number 1) and ground Q: Are the harness wires between fan controller connector A-30 (terminal number 1) and ground damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 9 RADIATOR FAN AC AB <24L-M/T> CONNECTOR C-49 <24L-A/T, 30L> STEP 9 Check the circuit at ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L- M/T>or PCM connector C-50 (terminal number 18) <24L-A/ T>, C-52 (terminal number 18) <30L-A/T> (1) Connect ECM connector C-49 (terminal number 21) <24L- M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/T> (2) Start the engine and allow it to idle (3) Measure the voltage between terminal number 21 <24L-M/ T> or 18 <24L-A/T, 30L> and ground Q: Is the voltage 07 volt or more when the radiator fan is operating? YES : Go to Step 11 NO : Go to Step 10 CONNECTOR C-50, C-51, C-52 AC AC

12 14-12 ENGINE COOLING DIAGNOSIS CONNECTOR: C-07 STEP 10 Check the harness wire between ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/ T> and fan controller connector A-30 (terminal number 2) NOTE: If intermediate connector C-07 (terminal number 6) is damaged, repair or replace it Refer to GROUP 00E, Harness Connector Inspection P00E-2 AC AC CONNECTOR: C-49 <24L-M/T>, C-50 <24L-A/T> C-51 <30L-M/T>, C-52 <30L-A/T> ECM <M/T> OR PCM <A/T> Q: Are the harness wires between ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/T> and fan controller connector A-30 (terminal number 2) damaged? YES : Repair or replace them, then go to Step 12 NO : Go to Step 11 AC AE CONNECTOR: A-30 RADIATOR FAN AC AB

13 14-13 ENGINE COOLING DIAGNOSIS <24L-M/T> CONNECTOR C-49 <24L-A/T, 30L> CONNECTOR C-50, C-51, C-52 AC000257AC STEP 11 Check the fan control module at ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/ T> (1) Disconnect ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C- 52 (terminal number 18) <30L-A/T> (2) Pull out pin 21 <24L-M/T> or 18 <24L-A/T, 30L> to disconnect it (3) Reconnect ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C- 52 (terminal number 18) <30L-A/T> with pin 21 <24L-M/T> or 18 <24L-A/T, 30L> still removed (4) Turn the ignition switch to "ON" position Q: Do the radiator fan motor and condenser fan motor operate? YES : Replace the ECM <M/T> or PCM <A/T> Then go to Step 12 NO : Replace the radiator fan motor and fan control module assembly Then go to Step 12 STEP 12 Check the symptoms Q: Do the radiator fan and condenser fan operate correctly? YES : This diagnosis is complete NO : Return to Step 1 INSPECTION PROCEDURE 4: Radiator Fan and Condenser Fan do not Change Speed or Stop NOTE: if the engine coolant temperature reaches 110 C (230 F) or higher, the radiator fan control runs the radiator fan for up to 5 minutes even after the ignition switch is turned to the "LOCK" (OFF) position [the fan stops its rotation when the engine coolant temperature decreases to 110C (230F) or lower] Radiator Fan and Condenser Fan Drive Circuit Refer to P14-6 CIRCUIT OPERATION The fan controller is powered from fusible link number 2 The ECM <M/T> or PCM <A/T> judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor The ECM <M/T> or PCM <A/T> activates the fan controller to drive the radiator fan motor and condenser fan motor TECHNICAL DESCRIPTION The fan controller has variable control of the radiator fan motor and the condenser fan motor speeds using signals transmitted from the ECM <M/T> or PCM <A/ T> TROUBLESHOOTING HINTS Malfunction of fan control relay Malfunction of fan controller Malfunction of ECM <M/T> or PCM <A/T>

14 14-14 ENGINE COOLING DIAGNOSIS DIAGNOSIS Required Special Tool: MB991223: Harness Set STEP 1 Check the fan control relay Refer to P14-20 Q: Is the fan control relay in good condition? YES : Go to Step 2 NO : Replace the part, then go to Step 6 CONNECTOR: A-09X STEP 2 Check the harness wire between fan control relay connector A-09X (terminal number 2) and fan controller connector A-30 (terminal number 3) Q: Are the harness wire between fan control relay connector A-09X (terminal number 2) and fan controller connector A-30 (terminal number 3) damaged? YES : Repair or replace the part, then go to Step 6 NO : Go to Step 3 A-09X CONNECTOR: A-30 AC AC RADIATOR FAN AC AB <24L-M/T> CONNECTOR C-49 <24L-A/T, 30L> CONNECTOR C-50, C-51, C-52 AC000257AC STEP 3 Check the circuit at ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L- M/T> or PCM connector C-50 (terminal number 18) <24L-A/ T>, C-52 (terminal number 18) <30L-A/T> (1) Connect ECM connector C-49 (terminal number 21) <24L- M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/T> (2) Start the engine and run it at idle [Engine coolant temperature: 80 C (176 F) or less] (3) Measure the voltage between terminal number 21 <24L-M/ T> or 18 <24L-A/T, 30L> and ground Q: Is the voltage 0 03 volt when radiator fan is not operating? YES : Go to Step 6 NO : Go to Step 4

15 14-15 ENGINE COOLING DIAGNOSIS CONNECTOR: C-49 <24L-M/T>, C-50 <24L-A/T> C-51 <30L-M/T>, C-52 <30L-A/T> ECM <M/T> OR PCM <A/T> STEP 4 Check the harness wire between ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/ T> and fan controller connector A-30 (terminal number 2) NOTE: If intermediate connector C-07 (terminal number 6) is damaged, repair or replace it Refer to GROUP 00E, Harness Connector Inspection P00E-2 Q: Are the harness wires between ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/T> and fan controller connector A-30 (terminal number 2) damaged? YES : Repair or replace them, then go to Step 6 NO : Go to Step 5 AC AE <24L-M/T> CONNECTOR C-49 <24L-A/T, 30L> CONNECTOR C-50, C-51, C-52 AC000257AC STEP 5 Check the fan controller at ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C-52 (terminal number 18) <30L-A/T> (1) Disconnect ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C- 52 (terminal number 18) <30L-A/T> (2) Pull out the terminal number <24L-M/T> or 18 <24L-A/T, 30L> and connect it to the body ground (3) Reconnect ECM connector C-49 (terminal number 21) <24L-M/T>, C-51 (terminal number 18) <30L-M/T> or PCM connector C-50 (terminal number 18) <24L-A/T>, C- 52 (terminal number 18) <30L-A/T> with pin 21 <24L-M/T> or 18 <24L-A/T, 30L> still removed (4) Turn the ignition switch to the " ON" position Q: Do the radiator fan motor and condenser fan motor stop? YES : Replace the ECM <M/T> or PCM <A/T> Then go to Step 6 NO : Replace the radiator fan motor and fan controller assembly Then go to Step 6 STEP 6 Check the symptoms Q: Do the radiator fan and condenser fan operate correctly? YES : This diagnosis is complete NO : Return to Step 1

16 14-16 ENGINE COOLING DIAGNOSIS INSPECTION PROCEDURE 5: Radiator Fan does not Operate TECHNICAL DESCRIPTION The cause could be a malfunction of the radiator fan motor or an open circuit between the fan controller and the radiator fan motor TROUBLESHOOTING HINTS Malfunction of radiator fan motor Malfunction of fan controller INSPECTION PROCEDURE 6: Condenser Fan does not Operate DIAGNOSIS Replace the radiator fan motor and fan controller assembly Q: Does the radiator fan operate correctly? YES : There is no action to be taken? NO : Repair the wiring harness between the fan controller and the radiator fan motor Radiator Fan and Condenser Fan Drive Circuit Refer to P14-6 CIRCUIT OPERATION The fan controller is powered from fusible link number 2 The ECM <M/T> or PCM <A/T> judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor The ECM <M/T> or PCM <A/T> activates the fan controller to drive the radiator fan motor and condenser fan motor TECHNICAL DESCRIPTION The cause could be a malfunction of the condenser fan motor or of the fan controller TROUBLESHOOTING HINTS Malfunction of condenser fan motor Malfunction of fan controller DIAGNOSIS STEP 1 Check the condenser fan motor Refer to GROUP 55, Condenser and Condenser Fan Motor P55-51 Q: Is the condenser fan in good condition? YES : Go to Step 2 NO : Replace the fan motor, then go to Step 3 STEP 2 Check the fan controller Refer to P14-19 Q: Is the fan controller in good condition? YES : Go to Step 3 NO : Replace the fan controller, then go to Step 3 STEP 3 Check the symptoms Q: Does the condenser fan operate correctly? YES : This diagnosis is complete NO : Return to Step1

17 CAP ADAPTER ADAPTER ON-VEHICLE SERVICE ON-VEHICLE SERVICE ENGINE COOLANT LEAK CHECK M WARNING When pressure testing the cooling system, slowly release cooling system pressure to avoid getting burned by hot coolant CAUTION Be sure to completely clean away any moisture from the places checked When the tester is taken out, be careful not to spill any coolant from it Be careful when installing and removing the tester and when testing not to deform the filler neck of the radiator 1 Check that the coolant level is up to the filler neck Install a radiator cap tester and apply 160 kpa (23 psi) pressure, and then check for leakage from the radiator hose or connections 2 If there is leakage, repair or replace the appropriate part ACX01844 AB CAP ADAPTER RADIATOR CAP PRESSURE CHECK M NOTE: Be sure that the cap is clean before testing, since rust or other foreign material on the cap seal will cause an improper indication 1 Use a cap adapter to attach the cap to the tester 2 Increase the pressure until the indicator of the gauge stops moving Minimum limit: 64 kpa (92 psi) Standard value: kpa (11 15 psi) 3 Replace the radiator cap if the reading does not remain at or above the limit ACX01845 AB

18 14-18 ON-VEHICLE SERVICE ENGINE COOLANT REPLACEMENT M Turn the ignition switch to the "ON" position, and then rotate the heater control to the "MAX HOT" position 2 Turn the ignition switch to the "LOCK" (OFF) position 3 Raise the vehicle at the front with a garage jack GARAGE JACK AC106167AB DRAIN PLUG AC000106AB CAUTION When removing the radiator cap, use care to avoid contact with hot coolant or steam Place a shop towel over the cap and turn the cap counterclockwise a little to let the pressure escape through the vinyl tube After relieving the steam pressure, remove the cap by slowly turning it counterclockwise 4 Remove the radiator cap, radiator drain plug and if equipped engine coolant drain plug to drain the coolant 5 Remove the reserve tank and drain the coolant 6 After completely draining the coolant, reinstall the drain plugs and flush the engine and radiator using a radiator cleaning fluid 7 After the flushing is completed, completely drain the cleaning fluid and install the radiator and engine drain plugs MB AIR HOSE AC106423AB CAUTION Do not use alcohol or methanol anti-freeze or any engine coolants mixed with alcohol or methanol anti-freeze The use of an improper anti-freeze can cause corrosion of the aluminum components 8 By referring to the section on coolant, select an appropriate concentration for safe operating temperature within the range of 30 to 60 % Use special tool MB to refill the coolant A convenient mixture is a 50 % water and 50 % antifreeze solution [freezing point: 31 C ( 328 F)] Recommended antifreeze: MITSUBISHI GENUINE Part NOMD or equivalent Quantity: <24L Engine> 70 dm 3 (74 quarts) <30L Engine> 80 dm 3 (85 quarts) 9 Reinstall the radiator cap

19 14-19 ON-VEHICLE SERVICE 10Start the engine and let it warm up until the thermostat opens 11After repeatedly revving the engine up to 3,000 r/min several times, then stop the engine 12Remove the radiator cap after the engine has become cold, and pour in coolant up to the brim Reinstall the cap CAUTION Do not overfill the reserve tank 13Add coolant to the reserve tank between the "FULL" and "LOW" mark if necessary ENGINE COOLANT CONCENTRATION TEST M Refer to GROUP 00, RECOMMENDED LUBRICANTS AND LUBRICANT CAPACITIES TABLE P00-36 FAN CONTROLLER AC000274AC FAN CONTROLLER CHECK M Remove condenser fan motor connector 2 Start the engine and run it at idle 3 Turn the A/C switch to ON and maintain the coolant temperature at 80 C (176 F) or less 4 When measuring the voltage between the fan controller-side connector terminals, check that the value changes repeatedly as indicated by (1) (3) below (1) 0 V (2) 82 ± 26 V (3) Battery positive voltage ± 26 V 5 If the voltage does not repeatedly change as indicated, replace the radiator fan motor and the fan controller assembly

20 14-20 FAN CONTROL RELAY ON-VEHICLE SERVICE FAN CONTROL RELAY CONTINUITY CHECK M BATTERY VOLTAGE TERMINAL NO TO BE CONNECTED TO TESTER CONTINUITY TEST RESULTS Not applied 4 2 Open circuit Connect terminal No3 and battery ( ) terminal Connect terminal No1 and battery (+) terminal 4 2 Less than 2 ohm AC102593AB

21 REMOVAL AND INSTALLATION RADIATOR RADIATOR M Pre-removal Operation Engine Coolant Draining [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] Post-installation Operation A/T Fluid Supplying and Checking (Refer to GROUP 00, Maintenance Service Automatic Transmission Fluid P00-53) Engine Coolant Supplying [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] 12 ± 2 N m 100 ± 22 in-lb 8 12 ± 2 N m 100 ± 22 in-lb ± 2 N m 100 ± 22 in-lb ± 10 N m 44 ± 8 in-lb RADIATOR REMOVAL STEPS 1 RADIATOR CAP 2 DRAIN PLUG 3 RUBBER HOSE CONNECTION 4 RESERVE TANK ASSEMBLY <<A>> >>A<< 5 RADIATOR UPPER HOSE <<A>> >>A<< 6 RADIATOR LOWER HOSE <<B>> 7 A/T OIL COOLER HOSE CONNECTION 8 RADIATOR SUPPORT 9 RADIATOR 10 LOWER INSULATOR 11 CONDENSER FAN MOTOR ASSEMBLY 12 RADIATOR FAN MOTOR ASSEMBLY 13 FAN AC AC RADIATOR REMOVAL STEPS 14 RADIATOR FAN MOTOR 15 SHROUD RADIATOR FAN MOTOR ASSEMBLY REMOVAL STEPS 1 RADIATOR CAP 2 DRAIN PLUG <<A>> >>A<< 5 RADIATOR UPPER HOSE 11 CONDENSER FAN MOTOR ASSEMBLY 12 RADIATOR FAN MOTOR ASSEMBLY 13 FAN 14 RADIATOR FAN MOTOR 15 SHROUD

22 14-22 RADIATOR REMOVAL SERVICE POINTS <<A>> RADIATOR UPPER HOSE/RADIATOR LOWER HOSE DISCONNECTION Make mating marks on the radiator hose and the hose clamp Disconnect the radiator hose MATING MARKS ACX01828 AB PROJECTION <<B>> A/T OIL COOLER HOSE REMOVAL After removing the hose from the radiator, plug the hose and the radiator nipple to prevent dust or foreign particles from getting in INSTALLATION SERVICE POINT >>A<< RADIATOR LOWER HOSE/RADIATOR UPPER HOSE CONNECTION 1 Insert each hose as far as the projection of the water inlet fitting 2 Align the mating marks on the radiator hose and hose clamp, and then connect the radiator hose WATER OUTLET FITTING MATING MARKS ACX01829AB

23 REMOVAL AND INSTALLATION THERMOSTAT THERMOSTAT M Pre-removal and Post-installation Operation Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] Air Cleaner Removal and Installation (Refer to GROUP 15, Air CleanerP15-6) <24L ENGINE> ± 2 N m 109 ± 21 in-lb <30L ENGINE> ± 1 N m 13 ± 1 ft-lb 1 1 REMOVAL STEPS <<A>> >>B<< 1 RADIATOR LOWER HOSE CONNECTION AC AD REMOVAL STEPS (Continued) 2 WATER INLET FITTING >>A<< 3 THERMOSTAT REMOVAL SERVICE POINT <<A>> RADIATOR LOWER HOSE DISCONNECTION Place mating marks on the radiator lower hose and hose clamp before disconnection INSTALLATION SERVICE POINTS RUBBER RING JIGGLE VALVE AC AB >>A<< THERMOSTAT INSTALLATION CAUTION Make absolutely sure that no oil adheres to the rubber ring of the thermostat Also be careful not to fold or scratch the rubber ring during installation Install the thermostat so that the jiggle valve is facing straight up Be careful not to fold or scratch the rubber ring >>B<< RADIATOR LOWER HOSE CONNECTION 1 Insert each hose as far as the projection of the water inlet fitting 2 Align the mating marks on the radiator hose and hose clamp, and then connect the radiator hose

24 14-24 THERMOSTAT INSPECTION Thermostat Check M Immerse the thermostat in water, and heat the water while stirring Check the thermostat valve opening temperature Standard value: ACX00400 ITEMS 24L ENGINE 30L ENGINE VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM VEHICLE WITH VARIABLE INDUCTION SYSTEM Valve opening temperature C ( F) 88 ± 15 (190 ± 3) 88 ± 15 (190 ± 3) 82 ± 15 (180 ± 3) 2 Check that the amount of valve lift is at the standard value when the water is at the full-opening temperature NOTE: Measure the valve height when the thermostat is fully closed, and use this measurement to compare the valve height when the thermostat is fully open Standard value: VALVE LIFT ACX00401AB ITEMS 24L ENGINE 30L ENGINE VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM VEHICLE WITH VARIABLE INDUCTION SYSTEM Full-opening temperature C ( F) 100 (212) 100 (212) 95 (203) Amount of valve lift mm (in) 85 (033) or more 90 (035) or more 90 (035) or more

25 REMOVAL AND INSTALLATION <24L ENGINE> WATER PUMP WATER PUMP M Pre-removal and Post-installation Operation Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service - Engine Coolant (Change) P00-56] Timing Belt Tensioner Pulley Removal and Installation (Refer to GROUP 11A, Timing Belt P11A-32) N ± 2 N m 16 ± 2 ft-lb 23 ± 3 N m 17 ± 3 ft-lb 14 ± 1 N m 117 ± 13 in-lb 2 3 N AC AB REMOVAL STEPS 1 GENERATOR BRACE >>B<< 2 WATER PUMP ASSEMBLY REMOVAL STEPS (Continued) 3 WATER PUMP GASKET >>A<< 4 O-RING

26 14-26 WATER PUMP <30L ENGINE> Pre-removal and Post-installation Operation Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] Timing Belt Removal and Installation (Refer to GROUP 11C, Timing Belt P11C-37) 23 ± 3 N m 17 ± 3 ft-lb 2 N 4 23 ± 3 N m 17 ± 3 ft-lb 1 REMOVAL STEPS THERMOSTAT (REFER TO P14-23) 1 BRACKET N 3 41 ± 8 N m 30 ± 6 ft-lb AC AB REMOVAL STEPS (Continued) >>B<< 2 WATER PUMP ASSEMBLY 3 WATER PUMP GASKET >>A<< 4 O-RING INSTALLATION SERVICE POINTS >>A<< O-RING INSTALLATION CAUTION Care must be taken not to permit engine oil or other grease to adhere to the O-ring When inserting the pipe, check to be sure that there is no sand, dirt, etc on its inner surface Rinse the mounting location of O-ring and water pipe with water, and install the O-ring and water pipe O-RING WATER PIPE ACX00402 AD

27 14-27 WATER PUMP >>B<< WATER PUMP ASSEMBLY INSTALLATION <24L ENGINE> L 7 2 D NO HARDNESS CATEGORY (HEAD MARK) BOLT DIAMETER(D) LENGTH (L) mm (in) 1 4T 8 14 (03 06) (03 09) (03 10) T 8 14 (03 06) (03 08) <30L ENGINE> (03 10) (03 24) (04 15) AC AB

28 14-28 WATER HOSE AND WATER PIPE WATER HOSE AND WATER PIPE REMOVAL AND INSTALLATION <24L ENGINE> M Pre-removal and Post-installation Operation Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] Thermostat Removal and Installation (Refer to P14-23) Exhaust Manifold Removal and Installation (Refer to GROUP 15, Exhaust Manifold P15-17) ± 2 N m 109 ± 21 in-lb ± 2 N m 109 ± 21 in-lb ± 4 N m 17 ± 3 ft-lb φ3 mm (012 in) N 7 13 ± 2 N m 109 ± 21 in-lb N φ3 mm (012 in) SEALANT: MITUBISI GENUINE PART NO MD OR EQUIVALENT REMOVAL STEPS <<A>> >>B<< 1 RADIATOR LOWER HOSE CONNECTION 2 WATER INLET FITTING 3 ENGINE COOLANT TEMPERATURE GAUGE UNIT CONNECTOR 4 WATER HOSE 5 HEATER HOSE CONNECTION >>A<< 6 THERMOSTAT CASE ASSEMBLY AC AB REMOVAL STEPS (Continued) >>C<< 7 O-RING 8 HEATER HOSE CONNECTION 9 WATER HOSE 10 WATER INLET PIPE ASSEMBLY >>C<< 11 O-RING >>A<< >>B<< 12 RADIATOR UPPER HOSE CONNECTION >>A<< 13 WATER OUTLET FITTING

29 <30L ENGINE> WATER HOSE AND WATER PIPE Pre-removal and Post-installation Operation Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service Engine Coolant (Change) P00-56] Intake Manifold Removal and Installation (Refer to GROUP15, Intake Manifold P15-15) Thermostat Removal and Installation (Refer to P14-23) Distributor Removal and Installation (Refer to GROUP 16, Distributor P16-53) 15 N ± 1 N m 13 ± 1 ft-lb N 14 ± 1 N m 117 ± 13 in-lb N N N 6 N 5 19 ± 1 N m 13 ± 1 ft-lb AC AB REMOVAL STEPS <<A>> >>B<< 1 RADIATOR UPPER HOSE CONNECTION <<A>> >>B<< 2 RADIATOR LOWER HOSE CONNECTION 3 WATER HOSE CONNECTION 4 HEATER HOSE CONNECTION 5 HEATER INLET PIPE A >>C<< 6 O-RING 7 HEATER INLET PIPE B REMOVAL STEPS (Continued) >>C<< 8 O-RING 9 WATER HOSE 10 WATER OUTLET FITTING 11 WATER HOSE 12 THERMOSTAT HOUSING ASSEMBLY 13 GASKET 14 WATER INLET PIPE >>C<< 15 O-RING

30 14-30 WATER HOSE AND WATER PIPE REMOVAL SERVICE POINT <<A>> RADIATOR UPPER/LOWER HOSE DISCONNEC- TION Make mating marks on the radiator hose and hose clamp Disconnect the radiator hose MATING MARKS ACX01828 AB WATER OUTLET FITTING OR THERMOSTAT CASE ASSEMBLY INSTALLATION SERVICE POINTS >>A<< WATER OUTLET FITTING <24L Engine>/THERMO- STAT CASE ASSEMBLY <24L Engine> INSTALLATION Apply a continuous bead of MITSUBISHI GENUINE Sealant Part number MD or equivalent to the thermostat housing mating surface AC AB PROJECTION >>B<< RADIATOR UPPER/LOWER HOSE CONNECTION 1 Insert each hose as far as the projection of the water outlet fitting 2 Align the mating marks on the radiator hose and hose clamp, and then connect the radiator hose WATER OUTLET FITTING MATING MARKS ACX01829AB

31 14-31 SPECIFICATIONS >>C<< O-RING INSTALLATION CAUTION Do not allow engine oil or other grease to adhere to the O- ring Install the O-ring to the water pipe, and coat the outer portion of the O-ring with water or engine coolant O-RING WATER PIPE ACX00402 AD INSPECTION Water Pipe and Hose Check M Check the water pipe and hose for cracks, damage and clogs Replace them if necessary SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS ITEM Radiator A/T oil cooler hose connection bolt <A/T> Radiator support bolt Reserve tank bolt Thermostat Water inlet fitting bolt <24L ENGINE> Water inlet fitting bolt <30L ENGINE> Water pump <24L ENGINE> Generator bolt Generator brace bolt Water pump bolt Water pump <30L ENGINE> Water pump bolt Water pump bracket bolt Water pump gasket bolt Water hose and water pipe <24L ENGINE> Thermostat case bolt Water inlet fitting bolt Water inlet pipe assembly bolt M SPECIFICATION 49 ± 10 N m (44 ± 8 in-lb) 12 ± 2 N m (100 ± 22 in-lb) 12 ± 2 N m (100 ± 22 in-lb) 13 ± 2 N m (109 ± 21 in-lb) 19 ± 1 N m (13 ± 1 ft-lb) 23 ± 2 N m (16 ± 2 ft-lb) 23 ± 3 N m (17 ± 3 ft-lb) 14 ± 1 N m (117 ± 13 in-lb) 23 ± 3 N m (17 ± 3 ft-lb) 23 ± 3 N m (17 ± 3 ft-lb) 41 ± 8 N m (30 ± 6 ft-lb) 23 ± 4 N m (17 ± 3 ft-lb) 13 ± 2 N m (109 ± 21 in-lb) 13 ± 2 N m (109 ± 21 in-lb)

32 14-32 SPECIFICATIONS ITEM Water outlet fitting bolt Water hose and water pipe <30L ENGINE> Heater inlet pipe bolt Thermostat housing bolt Water inlet pipe assembly bolt Water outlet fitting bolt SPECIFICATION 13 ± 2 N m (109 ± 21 in-lb) 19 ± 1 N m (13 ± 1 ft-lb) 19 ± 1 N m (13 ± 1 ft-lb) 14 ± 1 N m (117 ± 13 in-lb) 19 ± 1 N m (13 ± 1 ft-lb) SERVICE SPECIFICATIONS COOLANT M ITEMS STANDARD VALUE LIMIT High-pressure valve opening pressure of radiator cap kpa (psi) (11 15) 64 (92) Thermostat Valve opening 24L Engine 88 ± 15 (190 ± 3) - temperature of 30L Engine Vehicle without variable thermostat C ( F) induction system 88 ± 15 (190 ± 3) - Vehicle with variable induction system 82 ± 15 (180 ± 3) - Full-opening 24L Engine 100 (212) - temperature of 30L Engine Vehicle without variable thermostat C ( F) induction system 100 (212) - Vehicle with variable induction system 95 (203) - Valve lift mm (in) 24L Engine 85 (033) or more - 30L Engine 90 (035) or more - ITEMS QUANTITY dm 3 (qt) Mitsubishi Genuine Coolant or equivalent 24L Engine 70 (74) 30L Engine 80 (85) M SEALANT ITEMS SPECIFIED SEALANT REMARKS Thermostat case <24L Engine>, Water outlet fitting <24L Engine> MITSUBISHI GENUINE Part No MD or equivalent Semi-drying sealant M

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